[sonick]

Also re: whey, ON whey (among others like Dymatize) is filtered via a chemical process called ion exchange, vs Kaizen and other brands which use a physical filtering process (e.g. cross-flow filtration). Broscience suggests ion exchange although provides higher protein concentrations, the process may produce protein with lower bioavailability than standard filtering processes.

What Is The Ion Exchange In Whey Protein Powder? | LIVESTRONG.COM

Because of the chemical reagents used, such as hydrochloric acid, pH sensitive factions of the whey protein material may become denatured. This means that the amino acids are degraded. Some of the components often denatured include immunoglobulins---or antibodies---glycomacropeptides and other important immune system agents that boost anti-viral and anti-microbial activities. Some essential amino acids may also be lost, in addition to the ability to improve the absorption of vitamins and minerals in the digestive process.

Take it for what it's worth.